diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c0de7fe..172fdd9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,7 +9,7 @@ on:
 
 env:
   PYTHON_VER: '3.10'  # Python to run test/cibuildwheel
-  CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-*
+  CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-* cp313-*
   CIBW_TEST_COMMAND: python -m unittest regex.test_regex
 
 jobs:
diff --git a/regex_3/_regex.c b/regex_3/_regex.c
index 06d1a15..b17d4ab 100644
--- a/regex_3/_regex.c
+++ b/regex_3/_regex.c
@@ -50,6 +50,7 @@
 #include "Python.h"
 #include "structmember.h" /* offsetof */
 #include <ctype.h>
+#include <time.h>
 #include "_regex.h"
 #include "pyport.h"
 #include "pythread.h"
diff --git a/regex_3/regex.py b/regex_3/regex.py
index 428a159..b32c677 100644
--- a/regex_3/regex.py
+++ b/regex_3/regex.py
@@ -241,7 +241,7 @@
   "VERSION1", "X", "VERBOSE", "W", "WORD", "error", "Regex", "__version__",
   "__doc__", "RegexFlag"]
 
-__version__ = "2.5.142"
+__version__ = "2.5.144"
 
 # --------------------------------------------------------------------
 # Public interface.
diff --git a/setup.py b/setup.py
index 57188fd..832d537 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
 from setuptools import setup, Extension
 from os.path import join
 
@@ -7,7 +8,7 @@
 
 setup(
     name='regex',
-    version='2024.4.28',
+    version='2024.5.10',
     description='Alternative regular expression module, to replace re.',
     long_description=long_description,
     long_description_content_type='text/x-rst',
@@ -26,6 +27,7 @@
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Topic :: Scientific/Engineering :: Information Analysis',
         'Topic :: Software Development :: Libraries :: Python Modules',
         'Topic :: Text Processing',
diff --git a/tools/build_regex_unicode.py b/tools/build_regex_unicode.py
index 1507bb0..f19f89b 100644
--- a/tools/build_regex_unicode.py
+++ b/tools/build_regex_unicode.py
@@ -1,4 +1,4 @@
-#! python3.11
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
 # This Python script parses the Unicode data files in the UCD.zip file and